Digitization + IT.

multidisziplinary consulting.

Digitization and networking impact all areas of daily life. They simplify and even revolutionize procedures and production processes, but at the same time they raise a host of important legal questions. If, in particular, associated contractual or liability requirements are ignored or if, for example, questions regarding data protection and/or data security are not dealt with early on, this may not only significantly impede the use of new technologies but may ultimately make it impossible to introduce them. We securely and reliably advise and provide representation for our clients in all matters of IT law, in particular in connection with issues of contract, liability and data protection law. Our multidisciplinary team provides recommended actions for successfully implementing interlinked business and production processes.

range of consulting services.

e-commerce | data protection.
trademark law
digital accounting | processes.

e-commerce | data protection.

Sonntag & Partner has extensive expertise in the subject areas of social media, e-commerce, and mobile commerce. We advise and support our clients in drafting contracts, general terms and conditions, and with regard to duties to provide information.


  • Initiation of data protection management
  • Regulations on order data processing
  • Employee data protection
  • Customer relationship, data warehouse and scoring
  • Data protection on the Internet
  • Legal evaluation and securing websites, Internet portals, online shops
  • Distribution and marketing in e-commerce and mobile commerce
  • Distribution and marketing via social media platforms
  • Preparing general terms and conditions
  • Preparing terms of use
  • Counsel with respect to duties to provide information in distance selling transactions/in electronic legal transactions
  • Customer information, cancellation instructions, etc.
  • Contract drafting
  • Customer protection
More on the subject |  data protection
Julian N. Modi
  • Partner | Lawyer

trademark law

  • Trademark strategies for worldwide trademark protection
  • Trade mark searches, trade mark applications, trade mark monitoring
  • Enforcement and defence of trade mark rights - opposition and cancellation proceedings (DPMA, EUIPO, BPatG, EuG), cease-and-desist
  • letters, preliminary injunction and action proceedings
  • Combating product and trademark piracy (customs surveillance)
  • Drafting contracts (purchase agreements, trademark licence agreements, delimitation agreements)
  • Start-up advice with regard to naming
Julian N. Modi
  • Partner | Lawyer
Dr. Alfred N. Klinger
  • of Counsel | Lawyer
Dr. Birgit Müller
  • Lawyer
Robin Fiedler
  • Lawyer


Our multidisciplinary working teams advise with great proficiency and reliably assume management from a legal perspective of complex IT projects, as well legal support in introducing software solutions and with licensing negotiations.

subject areas.

  • Consulting and assistance with contract negotiations
  • IT project contracts
  • Software licensing agreements
  • Software development agreements
  • Contracts concerning software rentals and software leasing
  • Software maintenance and service contracts
  • Software escrow agreements (source format/source code)
  • Application service providing (ASP)
  • Consulting on cloud computing
  • IT outsourcing
  • IT distribution contracts


  • IT provider contracts
  • Consulting/representation in connection with infringements on software rights: Development and cooperation agreements
  • Developing IT guidelines
  • IT compliance
  • Assisting with IT audit procedures
Julian N. Modi
  • Partner | Lawyer

digital accounting | processes.

When setting up new processes in applying your own accounting, you should have a capable partner who ensures that these processes are optimally developed and comply with all legal requirements.


  • Creating digital accounting
  • Digital payment
  • Preparing process documentation
  • Employee training
  • Illustration of the parameters that the utilized accounting software must fulfill
  • Identifying the existing interfaces
  • How processing without media interruptions is possible
  • How one's own accounting can be prepared in the most efficient manner
  • Adopting the complete accounting
  • Support in efficiently processing accounting in the re-launch of your procedures
  • Monitoring your procedures related to complying with the GOBD
Jörg Seidel
  • Partner | Tax consultant

Wir verzahnen wirtschaftliche, steuerliche und rechtliche Aspekte und beraten fachübergreifend und auf Augenhöhe.

Wir begleiten große Familienvermögen, um langfristige Werte über Generationen zu bewahren.

Wir bieten maßgeschneiderte, praktikable Lösungen zu IT-Compliance, Digitalisierung und IT-Projektmanagement.

Wir bringen die Steuerberatung in das 21. Jahrhundert. Digital, modern, medienbruchfrei und am Puls der Zeit.

Wir beraten, bewerten und prüfen – national, aber auch international als unabhängiger MOORE-Netzwerkpartner.