Document security system
作者： Richard D. Caprio , Roland L. Engle
DOI:
关键词:
摘要: A protected document includes background printed matter and line pattern warning indicia. The indicia is slurrable upon copying to become visible.
lens.org 参考文章(4)
II David L. Brooks, Security document and method for making same using an alternating dot pattern ,(1979)
Arpad Somlyody, Protected document and method of making the same ,(1977)
Jr. William H. Mowry, Color copy resistant document using irregular outline letters in a multi-void background ,(1980)
Joseph Baran, Michael J. McElligott, Victor J. Tkalenko, William H. Mowry, Protected document and method of making same ,(1977)