If Γ is a q-axy code of length n and a,b,...,e are codewords, then c is called a descendant of a,b,...,e if c_i ∈ {a_i,b_i, ...,e_i} for i = 1,...,n. Codes Γ with the property that coalitions of a limited size have restrictions on their descendants are studied. Namely, we consider codes with the following partial identification property, referred to later as 2- secure frameproof codes (2-SFPC): any two non intersecting coalitions of size at most 2 have no common descendant.
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机译：如果Γ是长度为n的q轴码，而a，b，...，e是码字，则如果c_i∈{a_i，b_i，..，则c称为a，b，...，e的后代。 。，e_i} for i = 1，...，n。研究具有有限规模的联盟对其后代具有限制的性质的代码Γ。即，我们考虑具有以下部分标识属性的代码，以后称为2-安全帧验证代码（2-SFPC）：大小不超过2的任意两个不相交的联盟没有公共后代。
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