Utilize the input text as a context reference, choose the right relationship between Thomson Reuters and software from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Symantec Corp, the antivirus and security software maker best known for its Norton antivirus software, is expected to report first-quarter earnings slightly below analysts' expectations on Tuesday, according to Thomson Reuters I/B/E/S.

Answer: product_or_material_produced