Support Adobe Lock Files

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Situation

Adobe InDesign creates a lock file named ~test~0kjyv(.idlk for Test.indd when the document is opened, to prevent concurrent editing by multiple users.

Known Adobe Lock File Patterns

App	Extension	Naming pattern	Trigger
InDesign	.idlk	~{basename}~{random token}(.idlk	Opening any .indd document
InCopy (checkout)	.idlk	~{basename}~{random token}(.idlk	Checking out an .icml story
Premiere Pro	.prlock	{basename}.prlock	Opening any .prproj project
Illustrator	—	—	No lock file created
Photoshop	—	—	No lock file created
After Effects	—	—	No lock file created
Audition	—	—	No lock file created

Notes

• .idlk is used for two distinct cases: InDesign document locks (alongside .indd) and InCopy checkout locks (alongside .icml). The InCopy case is relevant for teams using Nextcloud as a shared editorial server.
• InDesign is known to not create a lock file when opening a document from a network or cloud path in some versions (fixed in InDesign 19.1 / 2024). Detection of .idlk files should therefore not be treated as a guarantee that a document is open — only as a signal that it is.
• Stale lock files can remain after an abnormal termination of InDesign or Premiere Pro.

To Do

• Detect .idlk files and treat them as lock files (do not sync or surface as regular files)
• Detect .prlock files and treat them as lock files
• Verify whether any other Creative Cloud apps create lock files not covered above