diff --git a/r2-shared/src/main/java/org/readium/r2/shared/extensions/JSON.kt b/r2-shared/src/main/java/org/readium/r2/shared/extensions/JSON.kt
index c5a8a222..d94e9299 100644
--- a/r2-shared/src/main/java/org/readium/r2/shared/extensions/JSON.kt
+++ b/r2-shared/src/main/java/org/readium/r2/shared/extensions/JSON.kt
@@ -178,6 +178,22 @@ fun JSONObject.optNullableInt(name: String, remove: Boolean = false): Int? {
     return value
 }
 
+/**
+ * Returns the value mapped by [name] if it exists, coercing it if necessary, or [null] if no such
+ * mapping exists.
+ * If [remove] is true, then the mapping will be removed from the [JSONObject].
+ */
+fun JSONObject.optNullableLong(name: String, remove: Boolean = false): Long? {
+    if (!has(name)) {
+        return null
+    }
+    val value = optLong(name)
+    if (remove) {
+        this.remove(name)
+    }
+    return value
+}
+
 /**
  * Returns the value mapped by [name] if it exists, coercing it if necessary, or [null] if no such
  * mapping exists.
diff --git a/r2-shared/src/main/java/org/readium/r2/shared/publication/LocalizedString.kt b/r2-shared/src/main/java/org/readium/r2/shared/publication/LocalizedString.kt
index ad4a0670..a330ce24 100644
--- a/r2-shared/src/main/java/org/readium/r2/shared/publication/LocalizedString.kt
+++ b/r2-shared/src/main/java/org/readium/r2/shared/publication/LocalizedString.kt
@@ -72,7 +72,7 @@ data class LocalizedString(val translations: Map<String?, Translation> = emptyMa
      * Returns a new [LocalizedString] after adding (or replacing) the translation with the given
      * [language].
      */
-    fun withString(language: String?, string: String): LocalizedString =
+    fun copyWithString(language: String?, string: String): LocalizedString =
         copy(translations = translations + Pair(language, Translation(string = string)))
 
     /**
diff --git a/r2-shared/src/main/java/org/readium/r2/shared/publication/encryption/Encryption.kt b/r2-shared/src/main/java/org/readium/r2/shared/publication/encryption/Encryption.kt
index 17e4ea74..71347560 100644
--- a/r2-shared/src/main/java/org/readium/r2/shared/publication/encryption/Encryption.kt
+++ b/r2-shared/src/main/java/org/readium/r2/shared/publication/encryption/Encryption.kt
@@ -15,6 +15,7 @@ import org.json.JSONObject
 import org.readium.r2.shared.JSONable
 import org.readium.r2.shared.util.logging.WarningLogger
 import org.readium.r2.shared.extensions.optNullableInt
+import org.readium.r2.shared.extensions.optNullableLong
 import org.readium.r2.shared.extensions.optNullableString
 import org.readium.r2.shared.util.logging.JsonWarning
 import org.readium.r2.shared.util.logging.log
@@ -34,7 +35,7 @@ import org.readium.r2.shared.util.logging.log
 data class Encryption(
     val algorithm: String,
     val compression: String? = null,
-    val originalLength: Int? = null,
+    val originalLength: Long? = null,
     val profile: String? = null,
     val scheme: String? = null
 ) : JSONable, Parcelable {
@@ -68,8 +69,8 @@ data class Encryption(
                 compression = json.optNullableString("compression"),
                 // Fallback on [original-length] for legacy reasons
                 // See https://github.com/readium/webpub-manifest/pull/43
-                originalLength = json.optNullableInt("originalLength")
-                    ?: json.optNullableInt("original-length"),
+                originalLength = json.optNullableLong("originalLength")
+                    ?: json.optNullableLong("original-length"),
                 profile = json.optNullableString("profile"),
                 scheme = json.optNullableString("scheme")
             )
diff --git a/r2-shared/src/main/java/org/readium/r2/shared/publication/epub/Metadata.kt b/r2-shared/src/main/java/org/readium/r2/shared/publication/epub/Presentation.kt
similarity index 51%
rename from r2-shared/src/main/java/org/readium/r2/shared/publication/epub/Metadata.kt
rename to r2-shared/src/main/java/org/readium/r2/shared/publication/epub/Presentation.kt
index ee894b53..98bf50a7 100644
--- a/r2-shared/src/main/java/org/readium/r2/shared/publication/epub/Metadata.kt
+++ b/r2-shared/src/main/java/org/readium/r2/shared/publication/epub/Presentation.kt
@@ -9,13 +9,15 @@
 
 package org.readium.r2.shared.publication.epub
 
-import org.readium.r2.shared.publication.Metadata
-
-// EPUB extensions for [Metadata].
-// https://readium.org/webpub-manifest/schema/extensions/epub/metadata.schema.json
+import org.readium.r2.shared.publication.Link
+import org.readium.r2.shared.publication.presentation.Presentation
 
 /**
- * Hints how the layout of the resource should be presented.
+ * Get the layout of the given resource in this publication.
+ * Falls back on REFLOWABLE.
  */
-val Metadata.layout: EpubLayout?
-    get() = EpubLayout(this["layout"] as? String)
+fun Presentation.layoutOf(link: Link): EpubLayout {
+    return link.properties.layout
+        ?: layout
+        ?: EpubLayout.REFLOWABLE
+}
diff --git a/r2-shared/src/test/java/org/readium/r2/shared/publication/LocalizedStringTest.kt b/r2-shared/src/test/java/org/readium/r2/shared/publication/LocalizedStringTest.kt
index 7ce2c53c..38a650df 100644
--- a/r2-shared/src/test/java/org/readium/r2/shared/publication/LocalizedStringTest.kt
+++ b/r2-shared/src/test/java/org/readium/r2/shared/publication/LocalizedStringTest.kt
@@ -196,7 +196,7 @@ class LocalizedStringTest {
             )),
             LocalizedString.fromStrings(mapOf(
                 "en" to "a string"
-            )).withString("fr", "une chaîne")
+            )).copyWithString("fr", "une chaîne")
         )
     }
 
diff --git a/r2-shared/src/test/java/org/readium/r2/shared/publication/epub/MetadataTest.kt b/r2-shared/src/test/java/org/readium/r2/shared/publication/epub/MetadataTest.kt
deleted file mode 100644
index e793e8f7..00000000
--- a/r2-shared/src/test/java/org/readium/r2/shared/publication/epub/MetadataTest.kt
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- * Module: r2-shared-kotlin
- * Developers: Mickaël Menu
- *
- * Copyright (c) 2020. Readium Foundation. All rights reserved.
- * Use of this source code is governed by a BSD-style license which is detailed in the
- * LICENSE file present in the project repository where this source code is maintained.
- */
-
-package org.readium.r2.shared.publication.epub
-
-import org.junit.Assert.*
-import org.junit.Test
-import org.readium.r2.shared.publication.LocalizedString
-import org.readium.r2.shared.publication.Metadata
-
-class MetadataTest {
-
-    @Test fun `get Metadata {layout} when available`() {
-        assertEquals(
-            EpubLayout.FIXED,
-            Metadata(
-                localizedTitle = LocalizedString("Title"),
-                otherMetadata = mapOf("layout" to "fixed")
-            ).layout
-        )
-    }
-
-    @Test fun `get Metadata {layout} when missing`() {
-        assertNull(Metadata(
-            localizedTitle = LocalizedString("Title")
-        ).layout)
-    }
-
-}
\ No newline at end of file
diff --git a/r2-shared/src/test/java/org/readium/r2/shared/publication/epub/PresentationTest.kt b/r2-shared/src/test/java/org/readium/r2/shared/publication/epub/PresentationTest.kt
new file mode 100644
index 00000000..08747cb9
--- /dev/null
+++ b/r2-shared/src/test/java/org/readium/r2/shared/publication/epub/PresentationTest.kt
@@ -0,0 +1,68 @@
+/*
+ * Module: r2-shared-kotlin
+ * Developers: Mickaël Menu
+ *
+ * Copyright (c) 2020. Readium Foundation. All rights reserved.
+ * Use of this source code is governed by a BSD-style license which is detailed in the
+ * LICENSE file present in the project repository where this source code is maintained.
+ */
+
+package org.readium.r2.shared.publication.epub
+
+import org.junit.Assert.*
+import org.junit.Test
+import org.readium.r2.shared.publication.Link
+import org.readium.r2.shared.publication.Properties
+import org.readium.r2.shared.publication.presentation.Presentation
+
+class PresentationTest {
+
+    @Test
+    fun `Get the layout of a reflowable resource`() {
+        assertEquals(
+            EpubLayout.REFLOWABLE,
+            Presentation(layout = null).layoutOf(createLink(EpubLayout.REFLOWABLE))
+        )
+    }
+
+    @Test
+    fun `Get the layout of a fixed resource`() {
+        assertEquals(
+            EpubLayout.FIXED,
+            Presentation(layout = null).layoutOf(createLink(EpubLayout.FIXED))
+        )
+    }
+
+    @Test
+    fun `The layout of a resource takes precedence over the document layout`() {
+        assertEquals(
+            EpubLayout.FIXED,
+            Presentation(layout = EpubLayout.REFLOWABLE).layoutOf(createLink(EpubLayout.FIXED))
+        )
+    }
+
+    @Test
+    fun `Get the layout falls back on the document layout`() {
+        assertEquals(
+            EpubLayout.FIXED,
+            Presentation(layout = EpubLayout.FIXED).layoutOf(createLink(null))
+        )
+    }
+
+    @Test
+    fun `Get the layout falls back on REFLOWABLE`() {
+        assertEquals(
+            EpubLayout.REFLOWABLE,
+            Presentation(layout = null).layoutOf(createLink(null))
+        )
+    }
+
+    private fun createLink(layout: EpubLayout?) = Link(
+        href = "res",
+        properties = Properties(
+            otherProperties = layout?.let { mapOf("layout" to layout.value) }
+                ?: emptyMap()
+        )
+    )
+
+}
\ No newline at end of file