The contractor document problem
Construction, engineering, and manufacturing projects run on shared documents: drawings, specifications, price schedules, work orders. Subcontractors legitimately need them during the job — and routinely keep them afterward, on personal devices, where they inform the next bid your competitor wins. NDAs help legally, but only technical controls change what actually happens to the files.
Scope access to the engagement, not forever
Share every project document through a protected link with an expiry matching the project timeline. When the job wraps, access ends automatically — no awkward requests to delete files, no forgotten copies. If the schedule slips, extending the expiry takes seconds.
For bid packages, add a view limit so the document cannot circulate beyond the estimator you sent it to.
Make every page traceable
Per-viewer watermarks put each subcontractor’s email on every page they see. If your unit pricing shows up in a rival’s bid, you know exactly which copy walked. Combine with disabled printing and downloading for the most sensitive commercial pages.
Tie work orders to signatures
Send work orders through the same protected channel with a signature requirement. Scroll-to-sign proves the sub read the full scope before signing, read receipts show when it was opened, and the signed copy is automatically delivered to your back office. Disputes about "what was agreed" resolve themselves when the evidence trail is complete.
End of project: one-click offboarding
When the relationship ends — on schedule or otherwise — revoke the contractor’s links in one click. Every document they were sent becomes unreadable on every device, immediately. That single capability is the difference between hoping your documents were deleted and knowing they are inaccessible.