Finally, software patents pose a constant threat to the existence of any free program. We wish to make sure that a company cannot effectively restrict the users of a free program by obtaining a restrictive license from a patent holder. Therefore, we insist that any patent license obtained for a version of the library must be consistent with the full freedom of use specified in this license.

Most GNU software, including some libraries, is covered by the ordinary GNU General Public License. This license, the GNU Lesser General Public License, applies to certain designated libraries, and is quite different from the ordinary General Public License. We use this license for certain libraries in order to permit linking those libraries into non-free programs.

When a program is linked with a library, whether statically or using a shared library, the combination of the two is legally speaking a combined work, a derivative of the original library. The ordinary General Public License therefore permits such linking only if the entire combination fits its criteria of freedom. The Lesser General Public License permits more lax criteria for linking other code with the library.

We call this license the "Lesser" General Public License because it does Less to protect the user's freedom than the ordinary General Public License. It also provides other free software developers Less of an advantage over competing non-free programs. These disadvantages are the reason we use the ordinary General Public License for many libraries. However, the Lesser license provides advantages in certain special circumstances.

For example, on rare occasions, there may be a special need to encourage the widest possible use of a certain library, so that it becomes a de-facto standard. To achieve this, non-free programs must be allowed to use the library. A more frequent case is that a free library does the same job as widely used non-free libraries. In this case, there is little to gain by limiting the free library to free software only, so we use the Lesser General Public License.

In other cases, permission to use a particular library in non-free programs enables a greater number of people to use a large body of free software. For example, permission to use the GNU C Library in non- free programs enables many more people to use the whole GNU operating system, as well as its variant, the GNU/Linux operating system.

Although the Lesser General Public License is Less protective of the users' freedom, it does ensure that the user of a program that is linked with the Library has the freedom and the wherewithal to run that program using a modified version of the Library.

The precise terms and conditions for copying, distribution and modification follow. Pay close attention to the difference between a "work based on the library" and a "work that uses the library". The former contains code derived from the library, whereas the latter must be combined with the library in order to run.

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1975W, 1980MWU, 1985WU, 1970W specifications

The Epson 1970W, 1985WU, 1980MWU, and 1975W projectors represent a robust lineup in the realm of portable projection technology, designed to meet a variety of professional and educational needs. These models are characterized by their versatile features, advanced technologies, and impressive specifications, making them ideal for business presentations, classrooms, and home entertainment.

The Epson 1970W is renowned for its exceptional brightness, boasting up to 4,500 lumens, which ensures clear and vivid images even in well-lit environments. It utilizes 3LCD technology, ensuring vibrant color fidelity and detailed visuals. The 1970W also supports WXGA resolution, providing 1280 x 800 pixel clarity, making it suitable for displaying text-rich presentations and intricate graphics with ease.

Following closely is the Epson 1985WU, which further elevates the projection experience with native WUXGA resolution at 1920 x 1200 pixels. This model is particularly effective for high-definition content, offering enhanced clarity for detailed images. The 1985WU also features an impressive brightness of 5,000 lumens, ensuring excellent performance across various lighting conditions. This projector incorporates wireless capabilities, allowing users to share presentations effortlessly from laptops or smart devices, enhancing its convenience in collaborative settings.

The Epson 1980MWU combines high brightness with mobility, perfectly suited for on-the-go professionals. With 4,400 lumens of brightness and WUXGA resolution, it delivers sharp images while maintaining portability. This model boasts an innovative design with easy setup features, including automatic keystone correction, allowing for quick adjustments during presentations. Its extensive connectivity options, including HDMI and USB ports, enhance usability, making it a versatile choice for diverse applications.

Lastly, the Epson 1975W caters to those who prioritize flexibility and ease of use. This model features 4,200 lumens of brightness and WXGA resolution, providing a commendable balance between clarity and vivacity. The 1975W is equipped with advanced features such as vertical/horizontal keystone correction and lens shift, which help simplify setup in various environments. Furthermore, it includes a robust suite of connectivity options, supporting seamless integration with various devices and ensuring that users can present with minimal fuss.

Together, the Epson 1970W, 1985WU, 1980MWU, and 1975W models showcase a powerful combination of brightness, resolution, and innovative technology. Whether for professional, educational, or personal use, these projectors deliver high-quality performance, catering to the diverse needs of today's users.