42 Providing temporary use of on-line non-downloadable software and applications for managing, locating, activating and revoking near field communication (NFC) tags, digital credentials and document authentication data; Customization of computer software; Computer software development in the field of mobile applications; Technical and customer support services, namely, troubleshooting of computer software for use in issuance and management of digital certificates or encryption of authentication and identification data used in near field communication (NFC) tags, digital credentials and document authentication data; Development, design, and implementation services in the field of security authentication encryption and identification data for NFC tags, digital credentials and document authentication data; scientific and technical analysis in the field of security, access, authorization, authentication encryption, and identification data and systems for NFC tags and NFC capable devices, namely, NFC enabled cell phones, smart phones and tablets; development, integration and operation of computer systems to support issuance and management of digital certificates for NFC tags and NFC capable devices, namely, NFC enabled cell phones, smart phones and tablets; Creation and implementation of procedures and practices for issuance and management of digital certificates for NFC tags and NFC devices, namely, NFC enabled cell phones, smart phones and tablets; Computer services, namely, detection of NFC tags that include viruses, malware and other threats; Design and implementation of software and technology solutions for the purposes of protecting against counterfeiting, tampering and diversion, and to ensure the integrity of NFC tags. Issuance and validation digital certificates for use in NFC tags and NFC-enabled devices, namely, NFC enabled smart phones, smartphones and tablets; Software as a service for provisioning and managing over-the-air credential technology; Providing security assurance and administration of digital certificates in the field of NFC tags; Data encryption services for document authentication data for others; Designing for others portable credential formats and related other security data, namely, creating custom credential formats used in NFC tags, NFC enabled mobile devices for document authentication