Laws and standards

Security:

Croatia personal data protection agency: www.azop.hr

Wikipedia:

Identity cards: 
www.en.wikipedia.org/wiki/Identity_document

Passports: 
www.en.wikipedia.org/wiki/Machine-readable_passport

MRZ code: 
www.en.wikipedia.org/wiki/Mrz

Checksum: 
www.en.wikipedia.org/wiki/Checksum

ISO standards for ID cards: 
www.en.wikipedia.org/wiki/ISO_7810
www.en.wikipedia.org/wiki/ISO_3166

Public Register of Authentic Identity and Travel Documents:
www.consilium.europa.eu/prado/EN/homeIndex.html

Barcode: 
http://en.wikipedia.org/wiki/Barcode

PDF417 Barcode: 
http://en.wikipedia.org/wiki/PDF417