Digital and printed variable document security. Anti-copy and anti-tamper feature.
Safe & Secure Encoding.
Invisible to the naked eye.
Cannot be copied or cannibalized.
Easily reveal differences.
Can be decoded optically or digitally.
Contracts, checks, mortgage coupons, payment receipts, identity documents, birth certificates, tax receipts, hazmat trip permits, labels…
Doc-U-Lok ® Strip
-Can be decoded digitally or with a lens.
-Revealed information is compared to printed information for discrepancies.
Doc-U-Lok Patch behind signature
Doc-U-Lok Patch decoded
Patents & Patents Pending patch.
*For a complete updated list, including foreign filings, please contact Graphic Security Systems Corporation.
Or contact us at patch.:
4450 Jog Road
Lake Worth, FL 33467