com.android.providers.userdictionary Copy

This is User Dictionary, the Android Open Source Project provider behind the android.provider.UserDictionary API. It stores the personal or custom words a user adds so that input methods and spellcheckers can use them for predictive text and to avoid flagging those words as misspelt. It holds data only and has no user interface beyond the "Personal dictionary" screen in Settings. In our sample it is signed by the platform or OEM signer on each build, consistent with it shipping inside the system image. Note a version-specific access change: from Android 6.0 (API 23) the user dictionary is only accessible to input methods and spellcheckers, where earlier releases let ordinary apps read and write it. Its role as the personal-words store is otherwise stable across releases. For Android Enterprise, EMM and kiosk fleets it is low impact and dormant unless a keyboard or spellchecker reads it. Disabling it loses any saved custom words and can cause keyboards or spellcheckers that query the provider to misbehave, so it is best left in place unless a single-purpose kiosk has no text entry.

• UserDictionary.Words | android.provider | Android Developers →
• Package signer provenance for com.android.providers.userdictionary - Android System App Database →

• Re-signed by each device maker with its own platform key - 33 different certificates appear across 19 device makers in our sample. That is the signature of a stock AOSP/system package every OEM builds and signs itself, not a single maker's or a third party's preinstall.
• Its largest observed manifest declares 2 permissions: 1 runtime (user-granted) and 1 vendor or uncatalogued.
• Never reported as user-facing, so it runs as a background or system component rather than an app the user opens.